A lot of heat is lost through the floor, Queenie. A good move is to put something like Celotex insulation board under the floor. The problem is that the floor level is raised, plus having to step up into the room. Doors would have to be shortened too.
Many thanks, I asked because my friend has a wooden floor and it's like walking on ice, but I'd still like one as I don't like vacuuming. (Perhaps her insulation is too thin)
I've got underfloor heating under mine and it's wonderful. The cat stretches out on it in the winter. I hoover mine with the brush attachment on as it gets the animal hair up or it blows around like tumbleweed.
Mine's fine Tilly, new build 3.5 years ago. Really didn't fancy underfloor heating at all but I love it now. Especially on a cold winter's morning when I pad across the kitchen floor in my bare feet and it's lovely and warm, not hot.